Mammary neoplasia is rare in nonhuman primates other than macaques; records in New World primates are exceedingly rare. We report the pathologic and immunohistochemical features of an invasive carcinoma no special type with neuroendocrine differentiation in a captive, black-handed spider monkey (Ateles geoffroyi).
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Serial visual reversal learning in captive black-handed spider monkeys, Ateles geoffroyi.
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IFM Biology, Linköping University, Linköping, SE-581 83, Sweden.
Recent research suggests that socio-ecological factors such as dietary specialization and social complexity may be drivers of advanced cognitive skills among primates. Therefore, we assessed the ability of 12 black-handed spider monkeys (Ateles geoffroyi), a highly frugivorous platyrrhine primate with strong fission-fusion dynamics, to succeed in a serial visual reversal learning task. Using a two-alternative choice paradigm we first trained the animals to reliably choose a rewarded visual stimulus over a non-rewarded one.
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September 2022
IFM Biology, Linköping University, SE-581 83 Linköping, Sweden. Electronic address:
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Department of Psychology.
An open question in comparative psychology is whether the source of correlations among different measures of ability (the factor) is shared between species, or is distinct. This is examined using data on the performance of three monkey species (tufted capuchins, black-handed spider monkeys, and long-tailed macaques) on 16 cognitive ability measures. The differences between species pairs across measures are not generally strongly related to the degree to which the g factor loads on each subtest.
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